[automerger skipped] identity: Fix attestation and documentation problems. am: e4f58f898f -s ours

am skip reason: Change-Id I2f8bd772de078556733f769cec2021918d1d7de6 with SHA-1 34abaaefcb is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/13036974

Change-Id: Ie81f83da014f88616ce2dfc1e621508da5b37a7c